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LTC3890-1 PDF预览

LTC3890-1

更新时间： 2024-11-05 05:43:59
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
36页 498K
描述
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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LTC3890-1 数据手册

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LTC3890-1  
60V Low I ,  
Q
Dual, 2-Phase Synchronous  
Step-Down DC/DC Controller  
DESCRIPTION  
FEATURES  
The LTC®3890-1 is a high performance dual step-down  
switching regulator DC/DC controller that drives all N-  
channel synchronous power MOSFET stages. A constant  
frequencycurrentmodearchitectureallowsaphase-lock-  
able frequency of up to 850kHz. Power loss and supply  
noiseareminimizedbyoperatingthetwocontrolleroutput  
stages out-of-phase.  
n
Wide V Range: 4V to 60V (65V Abs Max)  
IN  
n
n
n
n
Low Operating I : 50μA (One Channel On)  
Q
Wide Output Voltage Range: 0.8V ≤ V  
≤ 24V  
OUT  
R
or DCR Current Sensing  
SENSE  
Out-of-Phase Controllers Reduce Required Input  
Capacitance and Power Supply Induced Noise  
Phase-Lockable Frequency (75kHz to 850kHz)  
Programmable Fixed Frequency (50kHz to 900kHz)  
Selectable Continuous, Pulse Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
n
n
n
The50ꢀAno-loadquiescentcurrentextendsoperatinglife  
in battery-powered systems. OPTI-LOOP® compensation  
allows the transient response to be optimized over a wide  
range of output capacitance and ESR values. A wide 4V  
to 60V input supply range encompasses a wide range of  
intermediate bus voltages and battery chemistries.  
n
n
n
n
n
n
n
n
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Independent TRACK/SS pins for each controller ramp the  
output voltages during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
ThePLLIN/MODEpinselectsamongBurstModeoperation,  
pulse skipping mode, or continuous conduction mode at  
light loads.  
Low Shutdown I : <14μA  
Internal LDO Powers Gate Drive from V or EXTV  
No Current Foldback During Start-Up  
Narrow SSOP Package  
Q
IN  
CC  
APPLICATIONS  
Foraleadless32-pinQFNpackagewithadditionalfeatures  
of adjustable current limit, clock out, phase modulation  
and two PGOOD outputs, see the LTC3890 data sheet.  
L, LT, LTC, LTM, Linear Technology, Burst Mode, OPTI-LOOP and the Linear logo are  
registered trademarks of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. Protected by U.S. Patents including 5481178, 5705919,  
5929620, 6100678, 6144194, 6177787, 6304066, 6580258, 7230497.  
n
Automotive Always-On Systems  
Battery Operated Digital Devices  
n
n
Distributed DC Power Systems  
TYPICAL APPLICATION  
Efficiency and Power Loss  
vs Output Current (Buck)  
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter  
V
IN  
9V TO 60V  
10000  
1000  
100  
100  
90  
80  
70  
60  
50  
40  
30  
20  
22μF  
4.7μF  
V
V
= 12V  
IN  
OUT  
= 3.3V  
V
INTV  
CC  
IN  
TG1  
TG2  
0.1μF  
0.1μF  
BOOST1  
SW1  
BOOST2  
SW2  
4.7μH  
8μH  
BG1  
BG2  
LTC3890-1  
PGND  
10  
+
+
SENSE1  
SENSE1  
SENSE2  
1
0.01Ω  
0.008Ω  
10  
0
–
–
V
8.5V  
3A  
SENSE2  
OUT2  
V
OUT1  
3.3V  
5A  
V
V
0.1  
10  
FB1  
FB2  
0.0001 0.001  
0.01  
0.1  
1
100k  
470μF  
100k  
10.5k  
ITH1  
ITH2  
OUTPUT CURRENT (A)  
1000pF  
34.8k  
1000pF  
34.8k  
330μF  
TRACK/SS1 SGND TRACK/SS2  
0.1μF  
38901 TA01b  
31.6k  
0.1μF  
38901 TA01  
38901f  
1
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